<!DOCTYPE html>
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
<script>
	$(document).ready(function(){
		$("button").click(function(){
			$("ul li:first").hide();
		});
	});
</script>
</head>
<body>
<p>List 1:</p>
<ul>
	<li>First</li>
	<li>Second</li>
	<li>Third</li>
</ul>

<p>List 2:</p>
<ul>
	<li>Coffee</li>
	<li>Tea</li>
	<li>Cake</li>
</ul>
<button>Click me</button>
</body>
</html>